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Maltoni P, Barucca G, Rutkowski B, Spadaro MC, Jönsson PE, Varvaro G, Yaacoub N, De Toro JA, Peddis D, Mathieu R. Unraveling Exchange Coupling in Ferrites Nano-Heterostructures. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2304152. [PMID: 37888807 DOI: 10.1002/smll.202304152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 10/10/2023] [Indexed: 10/28/2023]
Abstract
The magnetic coupling of a set of SrFe12 O19 /CoFe2 O4 nanocomposites is investigated. Advanced electron microscopy evidences the structural coherence and texture at the interfaces of the nanostructures. The fraction of the lower anisotropy phase (CoFe2 O4 ) is tuned to assess the limits that define magnetically exchange-coupled interfaces by performing magnetic remanence, first-order reversal curves (FORCs), and relaxation measurements. By combining these magnetometry techniques and the structural and morphological information from X-ray diffraction, electron microscopy, and Mössbauer spectrometry, the exchange intergranular interaction is evidenced, and the critical thickness within which coupled interfaces have a uniform reversal unraveled.
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Affiliation(s)
- Pierfrancesco Maltoni
- Department of Materials Science and Engineering, Uppsala University, Box 35, Uppsala, 751 03, Sweden
| | - Gianni Barucca
- Dipartimento di Scienze e Ingegneria della Materia dell'Ambiente ed Urbanistica-SIMAU, Università Politecnica delle Marche, Ancona, 60131, Italy
| | - Bogdan Rutkowski
- Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Al. A. Mickiewicza 30, Kraków, 30-059, Poland
| | - Maria Chiara Spadaro
- Dipartimento di Scienze e Ingegneria della Materia dell'Ambiente ed Urbanistica-SIMAU, Università Politecnica delle Marche, Ancona, 60131, Italy
| | - Petra E Jönsson
- Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala, SE-751 20, Sweden
| | - Gaspare Varvaro
- Istituto di Struttura della Materia, nM2-lab, Consiglio Nazionale delle Ricerche, Monterotondo Scalo, Rome, 00015, Italy
| | - Nader Yaacoub
- Institut des Molécules et Matériaux du Mans, CNRS UMR-6283, Le Mans Université, Le Mans, F-72085, France
| | - José A De Toro
- Instituto Regional de Investigación Científica Aplicada (IRICA) and Departamento de Física Aplicada, Universidad de Castilla-La Mancha, Ciudad Real, 13071, Spain
| | - Davide Peddis
- Istituto di Struttura della Materia, nM2-lab, Consiglio Nazionale delle Ricerche, Monterotondo Scalo, Rome, 00015, Italy
- Dipartimento di Chimica e Chimica Industriale & INSTM, nM2-Lab, Università degli Studi di Genova, Via Dodecaneso 31, Genova, 1-16146, Italy
| | - Roland Mathieu
- Department of Materials Science and Engineering, Uppsala University, Box 35, Uppsala, 751 03, Sweden
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Anokhin EO, Deyankov DA, Xia Z, Kozlyakova ES, Lebedev VA, Morozov AV, Kozlov DA, Nygaard RR, Petukhov DI, Trusov LA. Synthesis of Sandwiched Composite Nanomagnets by Epitaxial Growth of Fe 3O 4 Layers on SrFe 10Cr 2O 19 Nanoplates in High-Boiling Organic Solvent. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 13:167. [PMID: 36616077 PMCID: PMC9824539 DOI: 10.3390/nano13010167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 12/22/2022] [Accepted: 12/26/2022] [Indexed: 06/17/2023]
Abstract
Herein, we demonstrate the synthesis of sandwiched composite nanomagnets, which consist of hard magnetic Cr-substituted hexaferrite cores and magnetite outer layers. The hexaferrite plate-like nanoparticles, with average dimensions of 36.3 nm × 5.2 nm, were prepared via a glass crystallization method and were covered by spinel-type iron oxide via thermal decomposition of iron acetylacetonate in a hexadecane solution. The hexaferrite nanoplates act as seeds for the epitaxial growth of the magnetite, which results in uniform continuous outer layers on both sides. The thickness of the layers can be adjusted by controlling the concentration of metal ions. In this way, layers with an average thickness of 3.7 and 4.9 nm were obtained. Due to an atomically smooth interface, the magnetic composites demonstrate the exchange coupling effect, acting as single phases during remagnetization. The developed approach can be applied to any spinel-type material with matching lattice parameters and opens the way to expand the performance of hexaferrite nanomagnets due to a combination of various functional properties.
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Affiliation(s)
- Evgeny O. Anokhin
- Faculty of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
- Faculty of Materials Science, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Danila A. Deyankov
- Faculty of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Zitian Xia
- Faculty of Materials Science, Lomonosov Moscow State University, Moscow 119991, Russia
- Faculty of Materials Science, MSU-BIT University, Shenzhen 518172, China
| | - Ekaterina S. Kozlyakova
- Faculty of Physics, Lomonosov Moscow State University, Moscow 119991, Russia
- Functional Quantum Materials Laboratory, National University of Science and Technology «MISiS», Moscow 119049, Russia
| | - Vasily A. Lebedev
- Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | | | - Daniil A. Kozlov
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Moscow 119991, Russia
| | - Roy R. Nygaard
- Faculty of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
- Faculty of Materials Science, MSU-BIT University, Shenzhen 518172, China
| | - Dmitry I. Petukhov
- Faculty of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Lev A. Trusov
- Faculty of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
- Faculty of Materials Science, MSU-BIT University, Shenzhen 518172, China
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Gorbachev EA, Trusov LA, Kovalenko AD, Morozov AV, Kazin PE. Sandwiched CoFe 2O 4/SrFe 11.5Al 0.5O 19/CoFe 2O 4 nanoparticles with exchange-coupling effect. NANOSCALE 2021; 13:18340-18348. [PMID: 34726677 DOI: 10.1039/d1nr05491k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Exchange-coupled hard/soft ferrite nanoparticles are prospective to squeeze out a part of expensive magnets based on rare-earth elements. However, the known exchange-coupled composite ferrite nanoparticles often suffer from the lack of a powerful enough hard magnetic core, high defectivity of magnetic phases, and a poor interface between them. Herein, we demonstrate the first efficient synthesis of sandwiched nanomagnets, which exhibit a pronounced exchange-coupling effect. This work is featured by the use of individual highly coercive strontium hexaferrite nanoplates prepared by a borate glass crystallization method as cores for the composite particles. The high crystal quality of the hexaferrite cores as the substrate promotes the epitaxial growth of CoFe2O4 layers on the 001 facets from an organic high-boiling solvent and results in the enhancement of the remanent magnetization and maximum energy product of the composite material. The results of this work open new prospects for the fabrication of multilayer oxide heterostructures with synergetic performance, which expands the applications of exchange-coupled composites.
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Affiliation(s)
- Evgeny A Gorbachev
- Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, 119991, Moscow, Russia.
- Faculty of Materials Science, MSU-BIT University, Longgang district, International University Park Road, No. 1, 517182, Shenzhen, China.
| | - Lev A Trusov
- Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, 119991, Moscow, Russia.
- Faculty of Materials Science, MSU-BIT University, Longgang district, International University Park Road, No. 1, 517182, Shenzhen, China.
| | - Anton D Kovalenko
- Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, 119991, Moscow, Russia.
| | - Anatoly V Morozov
- Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30, bld. 1, 121205, Moscow, Russia
| | - Pavel E Kazin
- Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, 119991, Moscow, Russia.
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Grindi B, BenAli A, Magen C, Viau G. M-SrFe 12 O 19 and ferrihydrite-like ultrathin nanoplatelets as building blocks for permanent magnets: HAADF-STEM study and magnetic properties. J SOLID STATE CHEM 2018. [DOI: 10.1016/j.jssc.2018.05.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Belec B, Dražić G, Gyergyek S, Podmiljšak B, Goršak T, Komelj M, Nogués J, Makovec D. Novel Ba-hexaferrite structural variations stabilized on the nanoscale as building blocks for epitaxial bi-magnetic hard/soft sandwiched maghemite/hexaferrite/maghemite nanoplatelets with out-of-plane easy axis and enhanced magnetization. NANOSCALE 2017; 9:17551-17560. [PMID: 29111545 DOI: 10.1039/c7nr05894b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Atomic-resolution scanning-transmission electron microscopy showed that barium hexaferrite (BHF) nanoplatelets display a distinct structure, which represents a novel structural variation of hexaferrites stabilized on the nanoscale. The structure can be presented in terms of two alternating structural blocks stacked across the nanoplatelet: a hexagonal (BaFe6O11)2- R block and a cubic (Fe6O8)2+ spinel S block. The structure of the BHF nanoplatelets comprises only two, or rarely three, R blocks and always terminates at the basal surfaces with the full S blocks. The structure of a vast majority of the nanoplatelets can be described with a SR*S*RS stacking order, corresponding to a BaFe15O23 composition. The nanoplatelets display a large, uniaxial magnetic anisotropy with the easy axis perpendicular to the platelet, which is a crucial property enabling different novel applications based on aligning the nanoplatelets with applied magnetic fields. However, the BHF nanoplatelets exhibit a modest saturation magnetization, MS, of just over 30 emu g-1. Given the cubic S block termination of the platelets, layers of maghemite, γ-Fe2O3, (M), with a cubic spinel structure, can be easily grown epitaxially on the surfaces of the platelets, forming a sandwiched M/BHF/M platelet structure. The exchange-coupled composite nanoplatelets exhibit a remarkably uniform structure, with an enhanced MS of more than 50 emu g-1 while essentially maintaining the out-of-plane easy axis. The enhanced MS could pave the way for their use in diverse platelet-based magnetic applications.
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Affiliation(s)
- B Belec
- Department for Materials Synthesis, Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.
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TiO 2 composite nanotubes embedded with CdS and upconversion nanoparticles for near infrared light driven photocatalysis. CHINESE JOURNAL OF CATALYSIS 2017. [DOI: 10.1016/s1872-2067(17)62929-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Xu X, Huang F, Shao Y, Zhou M, Ren X, Lu X, Zhu J. Improved magnetic and magnetoelectric properties in BaFe12O19 nanostructures. Phys Chem Chem Phys 2017; 19:18023-18029. [DOI: 10.1039/c7cp02276j] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Improved magnetism and magnetodielectric coupling are obtained in plate-like BaFe12O19 nanoparticles because of their larger structural distortion.
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Affiliation(s)
- Xingyu Xu
- National Laboratory of Solid State Microstructures and Physics School
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Fengzhen Huang
- National Laboratory of Solid State Microstructures and Physics School
- Nanjing University
- Nanjing 210093
- P. R. China
- Collaborative Innovation Center of Advanced Microstructures
| | - Ye Shao
- National Laboratory of Solid State Microstructures and Physics School
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Min Zhou
- National Laboratory of Solid State Microstructures and Physics School
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Xianming Ren
- National Laboratory of Solid State Microstructures and Physics School
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Xiaomei Lu
- National Laboratory of Solid State Microstructures and Physics School
- Nanjing University
- Nanjing 210093
- P. R. China
- Collaborative Innovation Center of Advanced Microstructures
| | - Jinsong Zhu
- National Laboratory of Solid State Microstructures and Physics School
- Nanjing University
- Nanjing 210093
- P. R. China
- Collaborative Innovation Center of Advanced Microstructures
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Wu L, Shen B, Sun S. Synthesis and assembly of barium-doped iron oxide nanoparticles and nanomagnets. NANOSCALE 2015; 7:16165-16169. [PMID: 26377439 DOI: 10.1039/c5nr05291b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A facile organic-phase synthesis of monodisperse barium-doped iron oxide (Ba-Fe-O) nanoparticles (NPs) is reported. The Ba-Fe-O NPs can be converted into hexagonal barium ferrite NPs at 700 °C, showing strong ferromagnetic properties with H(c) reaching 5260 Oe and M(s) at 54 emu g(-1). Moreover, the Ba-Fe-O NPs can be assembled into densely packed magnetic arrays, providing a unique model system for studying nanomagnetism and for nanomagnetic applications.
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Affiliation(s)
- Liheng Wu
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA.
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Long NV, Yang Y, Teranishi T, Thi CM, Cao Y, Nogami M. Related magnetic properties of CoFe2O4 cobalt ferrite particles synthesised by the polyol method with NaBH4 and heat treatment: new micro and nanoscale structures. RSC Adv 2015. [DOI: 10.1039/c5ra10015a] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
In this contribution, hierarchical CoFe2O4 particles are successfully prepared via a modified polyol elaboration method with NaBH4 and a proposed heat treatment process.
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Affiliation(s)
- Nguyen Viet Long
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Science
- Shanghai 200050
- China
| | - Yong Yang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Science
- Shanghai 200050
- China
| | | | - Cao Minh Thi
- Ho Chi Minh City University of Technology
- Ho Chi Minh City
- Vietnam
| | - Yanqin Cao
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Science
- Shanghai 200050
- China
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